You can convert the standard "positive" LCD (dark numbers on light background) to a "negative" LCD (light numbers on dark background) for a stealthier look.
Casio W-800H is a favorite in the modding community because its module contains several factory-disabled features that can be "unlocked" with simple hardware modifications. 1. The Countdown Timer Mod (Essential Hack) casio w-800h mod
One of the most famous Casio hacks is enabling the (CDT). Casio uses the same PCB (Module 3239) for various models but disables features on cheaper versions like the W-800H by using solder "jumpers". You can convert the standard "positive" LCD (dark